The second-largest giant sequoia in the world.

The largest lake in the Faroe Islands seems to be held hundreds of feet above sea level thanks to an optical illusion.

The tunnel's elegant proportions keep you snug with no claustrophobia freak-out.

Hamburgers are intensely proud of their tunnel beneath the river.

This beautiful natural train tunnel is said to grant the wishes of visiting lovebirds.

The romantic botanic tunnel feels like a well-kept secret.

A repurposed railway tunnel with otherworldly acoustic characteristics.

The U.K.'s first underground railway line is now a lively thoroughfare for runners and cyclists.

This former train tunnel is filled with lines from a poem crafted by Robert Louis Stevenson.

This brick-lined pedestrian walkway was once a railway tunnel used during the Civil War.

Home to the longest wooden escalators in the world.

Once a sewer culvert, this road tunnel now offers cyclists and pedestrians a subterranean stroll under the C&O Canal.

This nondescript tunnel has been featured in a number of iconic movies, from “Roger Rabbit” to “Back to the Future.”

This gorgeous Peranakan mansion’s family heritage includes a century-old baby gate, which was also used to keep out irresponsible husbands.

The world's oldest rose is so tough it survived being bombed in World War II.

This quirky little private museum is home to more than a thousand stones, carved by nature, that resemble human faces.

An eatery in a shallow river where diners can enjoy their meal mere feet from the base of an artificial waterfall.

This cliff-face port is considered a masterpiece of mining engineering.

This retro diner claims to be the birthplace of poutine.

Over 100 towers were built in Bologna during the Middle Ages, but only 22 survive.

A once grand hotel is being retaken by the wilderness it once capitalized on.

When the sun sets, the customers arrive—but they’re not human.

This enchanting hill is home to fairy lore and a sinister local mystery.

This dramatic sea spire is home to the world's rarest insect and is part of the lost continent of Zealandia.